Penalties for Forging a Signature on a Tax Return

Forging a signature on a tax return is a federal felony carrying up to three years in prison and a fine of up to $100,000 ($500,000 for a corporation), plus the costs of prosecution. On top of that criminal exposure, the IRS can add a civil fraud penalty equal to 75% of any unpaid tax tied to the forgery, an accuracy-related penalty, the back taxes themselves, and interest that compounds daily from the original due date. The penalties for forging a signature on a tax return apply whether the forger is the taxpayer, a spouse who faked a signature on a joint return, or a preparer who signed a client’s name.

Federal Criminal Penalties

Federal law treats a forged signature on a return as fraud under 26 U.S.C. § 7206. Two subsections do most of the work.

Section 7206(1) covers anyone who signs and files a return containing a declaration under penalty of perjury that they don’t believe is true. It’s a felony, punishable by up to three years in prison and a fine of up to $100,000, or $500,000 for a corporation, plus prosecution costs.¹

Section 7206(2) targets anyone who helps prepare or file a fraudulent return, even without the taxpayer’s knowledge or consent. This is the provision prosecutors use against tax preparers who forge client signatures, and it carries the same prison term and fine amounts.¹

State law can stack on top. Most states classify forgery as a felony on its own, and forging a tax document can result in separate state-level prosecution with additional prison time and fines. Severity depends on the financial impact and the defendant’s record.

Civil Fraud Penalty, Back Taxes, and Interest

The criminal fines are only part of what a forgery costs. The civil side is often larger.

The centerpiece is the civil fraud penalty: 75% of the portion of the underpayment attributable to fraud. If the IRS proves any part of the underpayment was fraudulent, the entire underpayment is treated as fraudulent unless the taxpayer proves otherwise by a preponderance of the evidence. On a joint return, the penalty reaches a spouse only if the IRS can show that spouse personally committed the fraud.²

The IRS may also add a 20% accuracy-related penalty on an underpayment caused by negligence or disregard of tax rules.³ Then come the back taxes and interest, which runs from the original due date at the federal short-term rate plus 3%, set quarterly, compounding daily.⁴

The math adds up quickly. Take a taxpayer who owes $50,000 in tax tied to a forged return. The fraud penalty alone adds $37,500. Layer on daily compounding interest over the years an investigation and prosecution take, and the total can double or triple the original tax bill.

How Long the IRS Has to Come After You

Federal prosecutors have six years from the date a forged return is filed to bring criminal charges under § 7206. The clock stops running during any period the suspect is outside the United States or is a fugitive.⁵

On the civil side, there is no time limit at all. When a return is false or fraudulent with intent to evade tax, the normal three-year assessment window does not apply, and the IRS can assess additional tax and penalties decades after the fact.⁶

Collateral Consequences of a Conviction

Prison and fines are the beginning of what a felony tax-forgery conviction costs.

Professional licensing boards for attorneys, accountants, and financial advisors routinely suspend or revoke licenses after a forgery conviction. For tax professionals, the IRS Office of Professional Responsibility can suspend, disbar, or censure the practitioner under Treasury Circular 230, ending the ability to represent clients before the agency. The monetary penalty against a preparer can reach the full amount of gross income the preparer earned from the misconduct, and the firm faces penalties too if it knew or should have known.⁷ State CPA boards may take separate action, including full revocation.

Employment tightens across the board. Most employers run background checks, and a felony tax fraud conviction is a disqualifier for any role involving financial responsibility. Lenders and landlords often treat felony convictions as risk factors, which can mean higher interest rates, denied applications, or lost housing.

For non-citizens, exposure runs deeper. Fraud is one of the most common offenses classified as a crime involving moral turpitude under immigration law.⁸ A conviction can trigger deportation, block naturalization, or make someone inadmissible for future entry.⁹

If Your Signature Was Forged

The penalties above land on the forger. If you’re the person whose signature was faked, the legal treatment depends on who did it.

A Spouse Forged Your Name on a Joint Return

When a spouse forges the other spouse’s signature on a joint return, that return is not a valid joint return. This is not the same as innocent spouse relief; it’s a more basic issue. Without your consent to file jointly, the joint election itself is invalid.¹⁰

Under IRS internal guidance, when a spouse proves the signature was forged and there was no implied consent to file jointly, the account is adjusted so both spouses are treated as having filed separately. The spouse whose signature was forged is not jointly or severally liable for anything on that return. The IRS may also refer the forging spouse to Criminal Investigation.¹¹

One caution: if you would owe more filing separately than the fraudulent joint return showed, pursuing the forgery claim could cost you money. The IRS notes that some spouses choose not to pursue the issue once they run the separate-filing math.¹¹ Work the numbers with a tax professional before committing.

A Tax Preparer Forged Your Signature

A preparer who signs your name without authorization faces criminal liability under § 7206(2) for aiding in the filing of a fraudulent document, along with the Circular 230 sanctions and monetary penalties described above.¹

If a preparer filed a return using your information without permission, treat it as identity theft. File Form 14039 (Identity Theft Affidavit) and attach it to a paper return if you can’t e-file because a duplicate has already been submitted under your Social Security number. The IRS will assign your case to a specialized identity-theft team, work to remove the fraudulent return from your records, release any refund you’re owed, and place an identity-theft indicator on your account. After the case is resolved, you’ll be enrolled in the Identity Protection PIN program and issued a new six-digit PIN each year.¹²

How to Report a Forged Tax Return

To report a forged signature or any false or altered tax document, submit Form 3949-A (Information Referral) to the IRS. If you have specific, credible information that leads the IRS to collect additional tax, you may qualify for a monetary award through the IRS Whistleblower Office by filing Form 211.¹³ If your own identity was compromised, file Form 14039 and follow the instructions on any notice you receive.

1
Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements
2
Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty
3
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
4
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
5
Office of the Law Revision Counsel. 26 USC 6531 – Periods of Limitation on Criminal Prosecutions
6
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
7
Internal Revenue Service. Regulations Governing Practice Before the Internal Revenue Service (Circular No. 230)
8
U.S. Department of State Foreign Affairs Manual. 9 FAM 302.3 – Ineligibility Based on Criminal Activity
9
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Conditional Bars for Acts in Statutory Period
10
Internal Revenue Service. Tax Relief for Spouses
11
Internal Revenue Service. 25.15.1 Introduction
12
Internal Revenue Service. How IRS ID Theft Victim Assistance Works
13
Internal Revenue Service. Report Tax Fraud, a Scam or Law Violation